Which of the following statements regarding intensity measurements is true?

The correct answer emphasizes the relationship between the two intensity measurements, distinguishing between known and unknown intensities. In many physics and engineering contexts, including radiation measurements, it is common to identify one intensity as a reference or known value (Intensity 2) against which another, variable intensity (Intensity 1) is measured. This is often done in experiments where comparisons are crucial for calculation or analytical purposes.

By labeling Intensity 1 as the unknown, the setup allows for the determination of this intensity based on comparisons with the known Intensity 2. The typical practice in measurement involves using a controlled or standardized reference point to validate results and calculations. This also aligns with various scientific principles where one quantity is treated as a variable while another serves as a constant to facilitate analysis.

Understanding this relationship is essential for carrying out and interpreting experiments accurately, particularly when evaluating radiation levels or other forms of intensity. Thus, recognizing which intensity is designated as known versus unknown plays a vital role in the assessment and understanding of measurement outcomes.